1, organizer. O6 U3 [' _4 y3 R
2, commitment& K$ K7 j8 Z1 c g ?6 V4 u
3, every paddler is different, some are recreational, some are serious competitors 9 [5 W7 P" A) b% n4, cost: R4 j0 ~7 O! c6 _7 f. U. u" M9 c
5, fitness level- p% [$ ~9 m( t) f! B0 i8 D+ }- L" t
6, whatever other factors
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看来不是很多人兴趣啊 0 C; w" ]2 c9 P8 l0 z% I ! l. W9 t! \& ^) c F. E& P Y }- X7 z' X6 N
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